Install PHP 8.1 dependencies ignoring php req

Author: GrahamCampbell

.github/workflows/tests.yml

@@ -33,6 +33,15 @@ jobs:
           timeout_minutes: 5
           max_attempts: 5
           command: composer update --no-interaction --no-progress
+        if: "matrix.php < 8.1"
+
+      - name: Install PHP 8.1 Dependencies
+        uses: nick-invision/retry@v1
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --no-interaction --no-progress --ignore-platform-req=php
+        if: "matrix.php >= 8.1"
 
       - name: Execute PHPUnit
         run: vendor/bin/phpunit